Over Consumption And Under Consumption in a Production Order

Dear Sir :

How can I manage an over-consumption and under-consumption in Production Order ?

For Example :

As per your BOM....you have to issue 10kg. of Grease to your Production Order for assembling of your FG. Now after completion of the Assembling, you found that only 9kg. of Grease only used for your assembling and 1kg of Grease is still lying.